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American Physical Society, Physical review B, 13(77)

DOI: 10.1103/physrevb.77.134426

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Evidence of random magnetic anisotropy in ferrihydrite nanoparticles based on analysis of statistical distributions

Journal article published in 2007 by N. J. O. Silva ORCID, V. S. Amaral, L. D. Carlos ORCID, B. Rodríguez-González ORCID, L. M. Liz-Marzán ORCID, T. S. Berquó, Subir K. Banerjee, V. de Zea Bermudez, V. de Zea Bermudez, A. Millán, F. Palacio
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Abstract

We show that the magnetic anisotropy energy of antiferromagnetic ferrihydrite depends on the square root of the nanoparticles volume, using a method based on the analysis of statistical distributions. The size distribution was obtained by transmission electron microscopy, and the anisotropy energy distributions were obtained from ac magnetic susceptibility and magnetic relaxation. The square root dependence corresponds to random local anisotropy, whose average is given by its variance, and can be understood in terms of the recently proposed single phase homogeneous structure of ferrihydrite. ; Comment: 6 pages, 2 figures